Gear case with members of stamped metallic plate easily removable and adjustable in length



E. M. BORGO. GEAR CASE WITH MEMBERS OF STAMPED METALLIC PLATE EASILYREMOVABLE AND Patented Jan. 3, 1922.

3 SHEETS-SHEET l n 2 l9 Hl Ta G5 N2 B E NF ID B A N flm UT 1A C Al- F PA E. M. BORGO. GEAR CASE WITH MEMBERS or, STAMPED METALLIC PLATE mmREMOVABLE AND ADJUSTABLE m LENGTH.

APPLICATION FILED FEB. 25, I920. 1 ,402 Q4g Patented. Jan. 3, 1922.,

E. M. BORGO. GEAR CASE WITH MEMBERS OF STAIVIPED METALLIC PLATE EASILYREMOVABLEAND 3 SHEETS-SHEET 3.

Patented Jan. 3, 1922.

ADJUSTABLE IN LENGTH. APPLICATION FILED FEB. 25, I920.

ILILIIIIL nnrronno mrcnnnr. noaeo, or Team. ITALY.

GEAR CASE -WI'1H'MEMBERS 0F STAMPED METALLIC PLATE EASILY REMIOVATBLE AND ADJUSTABLE IN LENGTH. a

Specification of Letters Eatent.

Patented Jan. 3, 1922.

Application filed February 25, 1920. Serial No. 361,207.

To all whom it may concern:

Be it known that I, EDMONDO MICHELE Bonco, a subject of the King ofItaly, residing at Turin, Italy, have invented certain new and usefulImprovements in Gear Cases with Members of Stamped Metallic Plate EasilyRemovable and Adjustable in Length; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the artto which 'it appertains tomake and use the same, reference being had to the accompanying drawings,and to. letters or figures of reference marked thereon, which form apart of this specification.

The. present invention has for its object a gear case with members ofstamped metal+ lic plate easily removable and adjustable in length,which maybe used for any kind of chain transmission, especiall for thatof automobile vehicles in genera and particularly motorcycles.

This gear case consists of two portions, sliding one upon the other, andeach composed of two members. The first portion, formed as a case forone of the two sprockets, and two tubular parts for the two sides of thechain, consists of two members of stamped plate, jointed together on alongitudinal plane. The second portion, formed as a case for the othersprocket, consists of two members of stamped plate jointed' together ona transversal plane which maybe diametral. One of these members isremovable to allow of repairs to be made to the vchain, and the other isprovided with sleeves into which the tubular parts of the first portionslide, with the object of allowing any variation in the length of thecase at the moment oi the tension adjustmentof the chain. In thisgearcase the two members of each portion are connected,-by means of the samefastening members which serve tosecure the whole of the gear case to twofixed points of support.

A constructional :form of the gear case in accordance with the presentinvention will be hereinafter described, with reference to the annexeddrawing, which 'is given "merely as an example, in its application tothe chain drive from the motor-to the rear wheel of a motorcycle. It isunderstood, however, that this application isdescribed and illustratedmerely by way of explana? tion andconsequently it in no way limits theapplication of the object'of the inven: tion.

In this drawing :--F ig. 1 gives a general view in side elevation of theapplication of the gear case to the chain drive of the motorcycle; Figs.2 and 3 show a gear case in de--.

The first consists of the end case -a and of the two tubular pieces b inone piece with the case. The second portion .c-, forming the other endcase, is provided with sleeves in which are inserted and made to slidethe ends of the tubular pieces 'b-. The two cases w and c are intendedto containthe front sprocket Z--, and rear sprocket e-, respectively ofthese sprockets the front one cZ is driven by the motor and is keyed tothe shaft of the latter or else to the countershaft issuing from thechange of speed casing f, while the rear one e is secured to the hub-gof the rear wheel -.-h of the vehicle. The two tubular pieces -b whichestablish the communication between the two cases .w and c are intendedto contain the two sides of the chain.

According to the invention, the end case aand the tubular pieces 'b, inone piece with it, are composed (see Figs. 2 to 5) of the two members ofstamped plate substantially symmetrical with respect to a longitudinalvertical plane These members are adjusted "one upon the other. Each ofthese members has the portions 1;- and ..2 --,stamped in theshape ofa.cup and :destined to constitute the two halves ofthe front sprocketwheel case ..a-.-.- and the two portions .-1*, and 2 having the shapeuofa trough and destined to constitute the two halvesof each ot the twotubular piecesebe. r V

The perimetral edge of the member 1, 1 is provided with a projectingflange platel welded thereto and whenthe two portions a,.a and b, b ofthe case are coupled the illperimetral a'djusting'edge, with aprojecting flange or plate 4 secured to it for instance by welding, onwhich the correspondin edge of the other member 8 is tightlyjointe Thefront member 3 of the case -c-- is provided with two sleeves 3, whichmay be bev-,

eled, in which are inserted the ends, which mayalso be beveled ifdesired, of the tubular pieces 'b The front wallof the case --c issufliciently enlarged to contain the outer portion of thehub g-- of thewheel -7z/- and'its sprocket -eand is provided at the center with theopening --0-,' each half of the openingbeing in one of the two 7 members3 and 4. The inner wall of the case is provided with a large opening forthe free passage of the annular projection e.-, with which the sprocket--e'- is provided, while the. two members 3 ands of the case areequipped at this point with the flanged edges 3" and 4t destined to fitas exactly as possible against the annular projection -,-,e-, without,however, coming into con tact with it."

The securing intheir relative positions of the diiierent members ofwhich the gear case is composed and'of the gear case as a whole in itsplace in respect to the sprockets T and chain is effected by means ofthe following arrangement (see Fig. 4).

The bottom wall of the member --1, constituting the rear half of thecase -w-, has a wide openingbounded by the edge 1, which is slightlyconical, destined to engage with the slightly conical projection Theportion --2- has on the outside a block 5 secured to it by welding, andhaving the open eye hand 'the milled nutx7, screwed to the threaded endoffi, engages with its hemispherical base 7 the interior of ahemispherical cavity 5 of the block 5. Owing to this arrangement,by'screwing the nut against the block 5, the front member -2, 2 of thegear case is fixed to the other member -1 ,,whil'e the whole of the twomembers, owing to the fitting of the conical edge 1' upon the conicalprojection ,-f of the casing f--, remains secured to the fixed supportconstituted by the said casing V 7 On the other hand the two members 3'and iconstituti'ng the case -c are assembled together and attached tothe frame of the naoapaa motorcycle fixing the front wall of the tihtening means which serve to fix the axle c'- of the hub .-g--, thesemeans con: sisting for instance of the screw -m-" which is screwedintothe axle fz'. I

Owing to theform of the gear case'as' described above itis evident thatwhen the chain is adjusted the gear case. is also easily regulated as tolength" by causing the portion-c-, to slide on the tubular pieces--bslidably. supported in the sleeves 3'. Any repairs of the chain caneasily be made by simply removing the removable rear member-4 of thecase -c, which can readily be done by slightly unscrewing the bolt mwhich fixes the axle io the hub to the rear bracket fk. Furthermore thegear case can be completely and quickly dismounted after unscrewing thebolt -m as well'as unscrewing and backwardswing: ing of the bolt 6, 7 asshown by dotted lines in Fig. 4 and, after having removed the chain, themounting of the diiierent members intheir proper places is eflected in amanner equally simple and rapid.' The gear case described above, owingto the exact fitting of its members, not only protects the chain andsprockets against exterior agencies, but also presents asuiiicienttightness to retain efiiciently' the lubricant which might beintroduced to lubricate the chain 7 having sleeves, theother wheelcasing havng tubular extensions and longitudinally divided into twoparts, the ends of said extensions slidably bearing in said sleeves.

2. A gear case comprlsingtwo wheel case ings, one ,of which .is'centrally divided transversely into twoportions, one of which portionshas two sleeves'and the other wheel casing having integral tubularextensions whose ends have sliding bearing in said sleeves, said casingand extensions being longitudinally divided into a front and a rearportion, and said rear aperforated depression.

'3. A gear case comprising two wheel casportion having ings one of whichis. transversely divided .i

into two portions, one'of whch portions has two sleeves; and the otherwheel casing having integral. tubular extensions whose ends have slidingbearing in said sleeves, said casing and extensions being longitudinallydivided into a front and a rear portion,

iaoaoae said rear portion having a central perforated conical depressionand said front portion having an open eye, and a bolt pivoted to astationary machine part to enter said perforation being in a conicalwheel hub receiving depression, a flanged sleeve pass ing through saidfront perforation, a washer on said sleeve the front of both portionsbeing clamped between the flange of said sleeve and said washer, and afront wheel casing having tubular extensions having sliding support insaid sleeves.

as my invention, I have signed my name.

EDMONDO MICHELE, BORGO.

' 20 1 In testimony that I claim the foregoing

